Question

cancer is
a cluster of cells
uncontrolled cytokinesis
uncontrolled cell growth
tumor suppressor genes

Explanation:

Cancer is characterized by uncontrolled cell growth. A cluster of cells is a general term and not a specific definition of cancer. Cytokinesis is the division of the cytoplasm in cell - division and uncontrolled cytokinesis is not the most accurate description. Tumor - suppressor genes are genes that normally prevent cancer, not what cancer is.

Answer:

C. uncontrolled cell growth